I´m currently on the Ul'dah Battlefield against this Crystalcrabs. I´m Pugilist Rank 15 Level 17. I´m not able to defeat them. Is it possible to let some friend assist you in this Battle or can you only enter it alone?

I beat this fight as an armorer, but it took about 4 tries before the one NPC that is killing them survived. I just stood around and watched really.

This is what I did pretty much. I was a r15 pugilist and got hammered by those critters. In the end I just stood there while the NPC killed everything. I got in a hit or two every once in a while, but never enough to get any hate. Honestly though, I wasn't too happy about having a battle where I didn't get to do anything heh. I felt more like a bystander rather than an adventurer.

When it comes to sitting around not doing anything for long periods of time, only being active for short windows, and marginal changes and sidegrades I'd say FFXI players were the perfect choice for politicians.